Wrong depending on same version detection

[nico-abram]

Depending on the same crate twice using two different, but similar, versions gives me an error about depending on the same version. Changing it to depend on a more different version fixes it.
Example:

[dependencies]
glium =  "0.25"
imgui =  "0.1.0"
imgui-glium-renderer = "0.1.0"
imgui-winit-support = "0.1.0" 
imgui_copy = { version = "0.1.0-rc.1", package = "imgui" }

Output:
error: the crate test-imgui v0.0.2 (C:/_)depends on crateimgui v0.1.0 multiple times with different names
Changing one to version "0.0.X" works.

[ehuss]

I think this is to be expected. The semver requirement ^0.1.0-rc.1 will resolve to 0.1.0, and you can't have two of the same version. You can use =0.1.0-rc.1 to force the use of a pre-release, but that still won't work in your situation because it is still considered semver-compatible to 0.1.0 and it won't let you do that.

[ehuss]

I'm going to close this as somewhat expected, and a duplicate of #6016. Pre-releases don't quite work very well now (see #2222 which covers some of what is wrong).